Can you solve the private eye riddle? - Henri Picciotto
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- Опубліковано 25 кві 2022
- Practice more problem-solving at brilliant.org/TedEd
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As Numberland’s best detective, you thought you’d seen it all. But the desiccated corpses of prominent natural numbers have been showing up all over the city. A lockdown is ordered from sundown to sunrise, and it’s still not enough to stop what can only be described as a vampiric feeding frenzy. Can you figure out why the citizens of Numberland are being attacked? Henri Picciotto shows how.
Lesson by Henri Picciotto, directed by Igor Coric, Artrake Studio.
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I was just thinking about feeding frenzy 👀
This was a little bit terrible compared to other videos from this channel
Ive been watching all your videos.
This is the worst ..
Slime lines
Drained numbers.
Look forward to the next video.
@@Bibibosh I mean I liked it... there's only so much you can do with primes numbers after all
Keep up the good work
Pie=pi, Eye=i V=5
one of the strangest riddles ive seen on ted ed, but one of the only ones ive gone through smoothly without any trouble!
I couldn't figure out everything on this one lol, good for you!
I am totally with you on that
This one was more dependant on background knowledge to solve
Yup
Yes
Notice how the two characters are a pie (π, probably the most famous irrational number) and an eye (i, an imaginary number). Brilliant.
and e (euler's number) would have been their finance/case managers, presumably.
ikr
I had noticed the pie but hadn't gotten the eye joke, thanks
It's actually kinda weird 'cos if their irrational how can they make rational decisions
Oh yea
4:45 I love how 45 is casually walking his asterisk.
its on the 4-minute 45th mark BYEEEE
45 would definitely be drained because 45/5 = 9
@@anthonyvsrobloxtv4418 there are infinite numbers that can be drained the vampire doesn't have time to drain infinite numbers
Oh I see asterisk = at risk 😂
imagine there is a murderer in your town and you arent allowed to walk outside AT ALL. and then your roommate says "aight i gotta walk my pet rq"
Literally the only riddle I got all the correct answers to. My confidence in my math skills is restored!
I got most of my answers right with this one. Maybe it’s the fact I just woke up but I figured out the first problem has to do with prime numbers, but unsure with the slime line. I got the second one correct tho using a different method
Same here, buddy!!
I had a feeling all the victims were prime numbers
How about the laser robot ant things, it was easy.
kinda stumbled on figuring out the last number
If it wasn’t for the starting quote, I wouldn’t have been able to solve it. I actually felt really good realizing that only prime numbers were slimed and the healthy digits were primes!
Same
You mean composite numbers were slimed
@@kohwenxu right
@@kohwenxu non-primes, not composites. 1 is not a composite.
What starting quote?
The best part of the video is when they "round up" the vampire with the ceiling function
What I'm confused about is why 461 had slime between 4 and 6. Take that out, and you get 46 and 1, which still leads to all three digits getting drained. I'd figured out the "primes don't get drained" part, and "slime allows non-prime digits to be isolated in otherwise prime numbers" bit, but the extra slime between 4 and 6 was leading me to believe the slime had some other purpose as well.
My guess is that the vampire also works from left to right.
> Check the entire number. Is this a composite number? If so, cool, we're done, drain the entire thing.
> If not, isolate the first digit. Is this a composite number? If yes, put a slime line after it and drain it (or if it's followed by one or more zeroes, put a slime line before the first digit that's not a zero). Else, move on.
> If not, check the first two digits together. If this is a composite number, put a slime line after it and drain it, and so on.
> After a slime line is drawn, treat the next digit in line as if it was the new first digit.
> Continue until there are no numbers left to drain, either because all of them are drained or because everything that's left is prime
Thus, while 46 is indeed a composite number, 4 is checked first, found out to be a composite number too and is subsequently drained before 46 is even considered.
EDIT: My brain was derping when I first wrote this and wrote the wrong terminology. It's fixed now though.
I honestly think its just to show that a number can have more than one slime line, which in turn restricts larger (4-digit+) primes from being involved
I had the exact same problem, that line seems forced to show that more than one line can be made in the same number but it's quite unecessary
@@neobullseye1 I think you're right, that means the vampire would get it wrong against 631, a prime which can be split into 63 and 1. The vampire would eat the 6, and then he wouldn't be able to eat all of 31
one of the questions asks you to rearrange the slime lines in a number to see if they would still be drained or not. the extra slime is there just to show that the slime could be rearranged in several different ways to drain the victim
I really liked the wordplay in "They round him up", using the mathematical rounding function as his prison.
Particularly, his prison is a ceiling function, which always rounds numbers *up.*
5:28 “They round him up” very funny
"Round him up". Would have been funny if the vampire was a number itself and there were clues to reveal its identity.
Well, it clearly enjoys draining non-prime numbers, so I'm thinking it is a very non prime number with multiple divisors, like 360,720,1080,2520 etc
Its five, V, in Roman numerals.
Yeah, they use the ceil() brackets to literally round him up. It's pretty funny
@@robertjarman3703 And the minion "M" is 1000 in Roman numerals 😂
@@randomstuff3435 Yeah, but that raises the question of why 1000 is being a subordinate to 5.
I just saw a riddle coming on youtube and I'm like 'yay! a new riddle!' Thanks a lot for giving us new riddles TedEd!
Before I try to solve it, I love how the P.I. is actually a pie (and pi). And the other P.I. is an actual eye (or maybe i for imaginary number. If that's wrong, I haven't been in a math class in a very long time)
Mhm! And both pi(an infinite number) and i(square root of a negative number) are irrational numbers which can’t be affected by the vampire!
The visual pun on 'round him up' killed me. 😭
It was the strangest riddle I've seen on ted-ed, but it was a fun riddle. Great video. Hope for more strange and confusing riddles 🤣
That we will TOTALLY use in real life
@@mathguy37 its for fun bro
@@SunnyMoonwilluploadin no this is for this situation irl
The animation team of TED deserves a raise!
True!
I love how when he said “You round him up” the symbols for rounding up appear around the vampire
lol
😂
I wasn't expecting a riddle this early. Let alone a riddle like this. At least i'm glad i've solved it.
I realized that this is a 2 for 1 riddle video, keep making these great riddles Ted-Ed!
I finally solved a ted riddle by myself after almost watching all of them. Idk if I should be crying or being happy
5:29
"They round him up "
Hahahah nice one of your best jokes
I have no idea on whats going on, but I'm enjoying the video.
Great stuff.
Been watching these for years, and I've never paused it to answer them myself.
1:36 But why did it split the 4 and 6 in 461? Why didn't it just split it as 46 and 1 since it can then eat both parts? 🤨 I considered maybe it's working one digit at a time from left to right but that doesn't work either because then 137 could/would have slime between the 3 and 7, and 2099 would be 2, but then have a 0, in addition, 14 would be 1 and 4. I suspect this is just an oversight. 🤔
I went down the same path and was pretty disappointed that there was no answer to that.
sometimes the answer is just "because the vampire felt like it"
The vampire couldn't see well in the dark.
@@richardkurniawan6066 With this kind of thinking, the answer "The vampire rolled a dice" would be totally valid.
@@Epaminaidos might aswell be a possibility
That setting was sooooooo farfetched and I love it!
That bit about rounding up almost made me actually laugh.
Ted Ed: Can you solve the riddle?
Me: Are you going to ask me a riddle?
Ted: Maybe?
Me: An actual riddle? Not a convoluted math equation?
Ted: Mayyyybeeeee?
Me: I'll give it a shot.
Ted: It's math.
My thoughts exactly. 🤣
Riddle: a question or statement intentionally phrased so as to require ingenuity in ascertaining its answer or meaning, typically presented as a game
Math riddles are still riddles, by definition
Wow this was surprisingly easy. Barely took me two minutes. I am unable to solve most of TED Ed's riddles. I'm happy I could solve this one.
I love that the media person was the symbol of 'division'. Great touch!
Oh look, Mr. I from Mario seems to have evolved into a rather dapper gentleman! 😉😆
Agreed!
I can’t believe it. I finally solve the riddle after 2 weeks of trying to solve your hard thought-provoking riddles!
1:02 "Pause here if you want to figure it out for yourself!"
I am pausing the video to try to understand the problem.
Quite the oddball riddle this time, but a very good one with an interesting story nonetheless!
Great riddle! Would’ve loved to see a full screen of the first riddle though.
Wow, I've actually solved a Ted Ed riddle for once.
Me: Okay, I REALLY need to get started on my homework-
Ted-Ed: *WHO WANTS A NEW RIDDLE VIDEO?!*
Me: I do! I do!
All three are lying: Watson and Hudson either have to both be telling the truth or both lying since they’re saying the exact same thing. If they’re both honest, then only one of the three can be lying, leading to a paradox. Thus, both are lying, and because we can’t have exactly two people lie (otherwise, they’d be telling the truth), Sherlock must also be lying.
This is the first riddle I figured out on my own. Nice video!
Ted Ed is amazing. I learn both math and genetic at the same time
Pi and i nice!
Coming up with such good riddles is really hard and I appreciate the efforts.
I actually solved both of the riddles just by pure luck!! I'm so ridiculously happy!
This can be 1 hour movie
This is the best Ted Ed riddle I've ever seen.
This one is one of the weirdest riddles I've seen
I love the stories behind these riddles
373 is my new favorite number (it changes every week...)
These riddles make bright side riddles look like one plus one
Honestly did not know one was not considered a prime number, I learned something today
Prime numbers have exactly two factors.
1 has only one factor (itself) and 0 has an uncountably infinite amount of factors (*all* numbers), so neither is technically considered prime.
This is a great riddle but it's also just a fun story. I love it
These always crack me up. I think I have only ever figured out one of the riddles I have seen out of 10 LOL
This video really reminded me of why I was interested in math when I was young.
THIS IS THE ONLY TED ED RIDDLE IVE SOLVED AND IM SO PROUD OF IT!!!!!!!
This riddle has *primed* my mind well
So 5 was the villain. The vampire being V, the roman numeral for 5.
How tho? 5 was kidnapped by M, a minion of V. You can see it here: 5:20
Discovered Ted X 2 years ago from today. Never regretted!
i imagine how like
vampire busts the door to some number party
then just stands there thinking where to slime while numbers stay in place and go "oh damn"
Ted Ed : "can you solve this epic riddle?"
Me : "Ulu"
Great job on the "rounding up"!
Loved the "rounding up" visual pun
Omg I love this video, I want more riddle videos In this style like the dragon jousting and coin flip president one.
Awesome and symbolic! I love relating to things.
5:42
Hudson & Watson: Accuse the others of lying
Sherlock: The light is off
Person in charge of the mouse: *makes Sherlock a liar*
Clever, but instead of calculating all that to find the vampire, they could've started going directly to the damn vampire castle 😆
*realization*........
another subtle math joke, perhaps? (The detectives are both irrational numbers)
I like how this could have been set out as a mathematical puzzle, rather than a murder mystery.
That “rounding up” joke at 5:29 was clever
When you solve a Ted Ed riddle: I’m gonna be a detective one day alright
Step 1: Confirm the numbers have green eyes.
Step 2: Ask the vampire to leave.
I love the story that goes along with it
My feed:
"Can you solve the-"
Me:
YESS
but actually, no
The Ted-Ed cinematic universe is wild
"They ROUND him UP" *takes the ceiling of V*
Very clever!
This video was really cool and I love it
its always prime numbers with these ted ed riddles i swear
5:43 Watson and Hudson are saying the exact same thing. Therefore, they must be true or false together. However, the fact that “exactly” is specified means they can’t tell the truth, or else there aren’t enough liars. Nor can Sherlock tell the truth and have the duo be lying about there being exactly 2 liars.
Therefore, all 3 are lying.
When the light is off Watson and Hudson are parodoxically both telling the truth and lying and Sherlock is telling the truth
When the light is on all 3 are lying/incorrect
Thanks to the hint at the very beginning 😂 Love 45 walking the dog in 4:45
They round him up? You… you win this round, TedEd
This is the objectively best riddle because of E Y E, and epic gamer Hello Neighbor type beats in the background
I got through this riddle smoothly, but it’s because the opening quote was a big giveaway on the first question.
Ceil function for the vampire
“You ceil (seal) him up”
Love it
The name has made this (for me) the hardest to find riddle.
When he said "they round him [the vampire] up" I was so numbers-oriented I was trying to figure out how you round the letter V
Never would've thought I've solve a mystery about a non-prime number - eating maniac in a fictional world about numbers.
7:"We did it guys! We solved the murders!"
6: "Uh guys, where is 9?"
7: *burps*
5:28 NO! NO! NO! DON'T CEILING HIM, THAT'LL MAKE HIM MORE POWERFUL! INSTEAD FLOOR HIM! FLOOR HIM! FLOOR HIM! FLOOR HIM! AAAAAAAAAA- **BANG**
when you can sucsessfully solve a ted ed riddle without struggling: *visible happiness*
What an ODD riddle. It wasn't too bad, though: EVEN I could solve it. Thank goodness I'm still in my PRIME.
You NEED to find a riddle that can easily slide into this story!
This felt like a fever dream
Why are ted ed riddles so hard 😭
Not seen this one yet but ik im right
@@sacredflames07 😂😂
O haven't seen the other ones, but this one was trivial. Give it a try.
I love the "rounding-up" joke!
Me this entire riddle "I understand this math but I don't care enough/ am too tired to do sh*t."
YAY! NEW RIDDLE!!!
Great video
I did this riddle on my own!
1. I noticed only the primes didn’t get drained, but nonprimes did.
Ans: Primes werent drained, while Nonprimes were.
2. I need to find the next 4 numbers that do not have any nonprime digits, and are themselves, prime. This is 37, (3 / 7, both prime)
We can eliminate every number with a nonprime as any of their digits, so every 40, 60, 80, and 90, and on, are weak. 3 digit numbers can be slimed in 3 different ways, one of which may be a nonprime, prime, prime, nonprime, nonprime, prime, nonprime, nonprime, nonprime, nonprime, nonprime, or a nonprime, prime. (Ex: 133. It’s a prime. 13 / 3 is immune, but both 1 / 33 and 1 / 3 / 3 isnt.)
57 is our next one. ( 5 / 7 doesn’t work, 57 doesn’t either.) Then comes 73, but now what? We couldn’t of done 71, as 1 isn’t prime, nor could we of done 75 (nonprime), 77 (nonprime), or 79 (prime, but 7 / 9 leaves 9 weak.) It seems we’re at a dead end. Any number in the 80’s and 90’s is not immune, due to their second digits…. That’s when I realized I forgot 53. (Prime, 5 / 3 safe.)
(TL;DR) basically numbers with a nonprime in any digit aren’t safe, nor with any slime combos that leave a nonprime.
that leaves 37, 53, 57, and 73, all with prime digits, and prime themselves.
Ans: 37, 53, 57 and 73.
(Wrong, 57 has 19 and 3 turns out my 3 digit = bad explanation was wrong 😭. anyways I haven’t gotten to three yet so I say 373 instead of 57, and turns out 4 digits are bad, not 3 lol)
11,13,15,17: Sobbing in the corner of the room.
15 isn't prime tho
When they describe the problem in these Ted Ed puzzle series, I feel like I am solving a hackerrank problem. Once I was waiting to hear the expected input and output 😅
I have no idea what I just saw but I think it's...cool.
Thanks for making a rodle video after over a year
This riddle was pretty easy lol, I was able to solve it pretty quickly
Look, we just put them all in Hilbert's Hotel and then get all the fractions to gaurd it. Infinite guards and plenty of space and comfort for the potential victims